feat: 邮箱验证码调整

wfc-modules/wfc-user/src/main/java/org/wfc/user/controller/UEmailController.java

@@ -49,7 +49,7 @@ public class UEmailController extends BaseController {
         String code = RandomUtil.randomNumbers(4);
         redisService.setCacheObject(key, code, Constants.MAIL_CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
         try {
-            MailUtils.sendText(email, "Registration verification code", "Your verification code is: " + code + ", The validity period is " + Constants.MAIL_CAPTCHA_EXPIRATION + " minutes, please fill in as soon as possible.");
+            MailUtils.sendText(email, "Your WANFI verification code", "Hi\nYour verification code is:\n" + code + "\nThis code will expire in " + Constants.MAIL_CAPTCHA_EXPIRATION + " minutes.\nFor your security, don't share it with anyone.");
         } catch (Exception e) {
             log.error("验证码短信发送异常 => {}", e.getMessage());
             return R.fail(e.getMessage());